{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LM2940S-8.0/NOPB","brand":"Texas Instruments","brandSlug":"texas-instruments","productSlug":"LM2940S-8.0-NOPB","canonicalUrl":"https://icboms.com/texas-instruments/LM2940S-8.0-NOPB","factsUrl":"https://icboms.com/api/mcp/products/LM2940S-8.0%2FNOPB","rawCanonicalId":null},"summary":{"shortDescription":"Texas Instruments LM2940S-8.0/NOPB, fixed 8V output LDO regulator, 1A output, 1V max dropout at 1A, PSRR 66dB at 120Hz, over-current/over-temp/reverse-polarity/short-circuit protection, -40°C to 125°C, DDPAK/TO-263-3 package, Tube.","salesMarkdown":"## Fixed 8 V rail for noise-sensitive loads The Texas Instruments LM2940S-8.0/NOPB is a fixed-output positive LDO regulator delivering 1 A at 8 V with a maximum dropout of 1 V at full load. The protection block covers over-current, over-temperature, reverse polarity, and short circuit — the four failure modes that kill a linear regulator in an automotive or industrial 24 V environment. ## Dropout and headroom planning The 1 V maximum dropout at 1 A sets the minimum input-to-output differential. For an 8 V output rail, the input must stay above 9 V worst-case — a 12 V nominal bus with 3 V of ripple or sag still clears the headroom. Below that the regulator drops out and the output follows the input minus the pass element's drop, losing regulation. Quiescent current is 10 mA typical, rising to 15 mA maximum at full supply. That Iq is higher than a modern CMOS LDO's microamp-level draw, but acceptable for a 1 A-rated bipolar design where the load current dominates the thermal budget. At 1 A with a 2 V input-to-output differential, the power dissipation is 2 W — the tab copper area and airflow set the junction temperature, not the package itself.","metaTitle":"LM2940S-8.0/NOPB Fixed 8V LDO Regulator, 1A, TO-263-3","metaDescription":"Texas Instruments LM2940S-8.0/NOPB fixed 8V output, 1A LDO regulator in DDPAK/TO-263-3 package. PSRR 66dB at 120Hz, dropout 1V max.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Analog & Data Acquisition"],"specifications":{"Mfr":"Texas Instruments","PSRR":"66dB (120Hz)","Series":"-","Package":"Tube","Output Type":"Fixed","Mounting Type":"Surface Mount","Package / Case":"TO-263-4, D²Pak (3 Leads + Tab), TO-263AA","Product Status":"Active","lifecycle_stage":"eol_hot","Control Features":"-","Current - Output":"1A","Base Product Number":"LM2940","Protection Features":"Over Current, Over Temperature, Reverse Polarity, Short Circuit","Number of Regulators":"1","Output Configuration":"Positive","Operating Temperature":"-40°C~125°C","Voltage - Input (Max)":"26V","Voltage Dropout (Max)":"1V @ 1A","Current - Supply (Max)":"15 mA","Voltage - Output (Max)":"-","Supplier Device Package":"DDPAK/TO-263-3","Current - Quiescent (Iq)":"10 mA","Voltage - Output (Min/Fixed)":"8V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1.3400","priceTiers":null},"links":{"datasheetUrl":"https://cdn.icboms.com/f1c4256f4019947c4206f2126daf8930.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/LM2940S-8.0%2FNOPB/alternatives.json"},"ai":{"faq":[{"question":"Does the LM2940S-8.0/NOPB have overcurrent protection?","answer":"Yes, the protection features include over current, over temperature, reverse polarity, and short circuit — covering the common fault modes in automotive and industrial 24 V systems."},{"question":"Is the LM2940S-8.0/NOPB compatible with the LM2940T-8.0?","answer":"The LM2940T-8.0 is the TO-220 through-hole variant of the same 8 V fixed-output LDO. The LM2940S-8.0/NOPB is the surface-mount DDPAK/TO-263-3 version. Both share the same electrical specifications — the choice is a board-assembly decision, not a parametric one."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/texas-instruments/LM2940S-8.0-NOPB","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/texas-instruments/LM2940S-8.0-NOPB when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T18:03:28.771Z","lastPublished":"2026-07-22T18:03:28.771Z","indexable":true}}